Normal Operation and Fault Conditions
WARNING: This page does not describe the selected car, but rather 38 other vehicles, including the 2024 Ford F-550 Super Duty, 2024 Ford F-450 Super Duty, 2024 Ford F-350 Super Duty, 2024 Ford F-250 Super Duty, and 2023 Ford F-550 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
With the ignition ON, the FCIM sends messages to the ABS module through the GWM over the MS-CAN. If the ABS module does not receive these messages within a certain time frame (usually less than 1 second), the module sets DTCs. For information on the messages sent to the ABS module by the FCIM, refer to the Description and Operation in the Anti-Lock Brake System (ABS) and Stability Control article.
PPT AS ABS MODULE DTC FAULT TRIGGER CONDITIONS
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| U0256:00 | Lost Communication With Front Controls Interface Module 'A' | Sets in continuous memory and on-demand when the ABS module is missing any of the FCIM messages. This can be due to a FCIM failure, a circuit failure on the MS-CAN or an excessive load on the network. |
| U0557:86 | Invalid Data Received From Front Controls Interface Module 'A': Signal Invalid | This DTC sets if the auto hold switch status message from the FCIM contains 'invalid' or 'faulted' instead of the actual switch state. This can be due to a FCIM failure, a circuit failure on the MS-CAN or an excessive load on the network. |